Figure 19 Port-Based Vlan Assignment; Figure 20 802.1Q Tagging (After Port-Based Vlan Assignment) - Nortel business policy switch 2000 User Manual

114 Chapter 2 Network configuration

Figure 19 Port-based VLAN assignment

PVID = 2
Untagged packet
CRC Data SA DA
Before
As shown in
switch through port 5, which is configured as a tagged member of VLAN 2. The
untagged packet remains unchanged as it leaves the switch through port 7, which
is configured as an untagged member of VLAN 2.

Figure 20 802.1Q tagging (after port-based VLAN assignment)

PVID = 2 Port 1
Port 6
Untagged member
of VLAN 2
Outgoing
untagged packet
(unchanged)
In Figure
VLAN = 3, PVID = 2). Port 5 is configured as a tagged member of VLAN 3,
and port 7 is configured as an untagged member of VLAN 3.
208700-C
Port 1 Port 2
802.1Q Switch
Port 6 Port 7
Figure 20, the untagged packet is marked (tagged) as it leaves the
Port 2 Port 3
802.1Q Switch
Port 7 Port 8
CRC
Data
SA
DA
21, untagged incoming packets are assigned to VLAN 3 (policy
Port 3
Port 8
Untagged member
of VLAN 2
Tagged member
of VLAN 2
CRC* Data Tag
(*Recalculated)
8100 Priority
16 bits 3 bits
Key
Priority - User_priority
CFI - Canonical format indicator
VID - VLAN identifier
Tagged member
of VLAN 2
BS45011A
SA DA
CFI VID = 2
1 bits 12 bits
After
BS45012A